Why is My Alexa Laughing at Me?

I can think of few things scarier than waking up in the middle of the night to have the in-home listening device, named Alexa, started cackling like a witch. But that is what's happening to owners of the Amazon Echo.

There’s not a prompt and there is no chime like the Echo would normally use before answering a question, she just starts laughing. Twitter and Reddit have both been flooded with comments about the unsettling problem. With one comment which said, “To make it worse, it sounds like Hillary!"